John Lackey, who twice defeated the St. Louis Cardinals in the 2013 World Series, will help them try to get back this season.

Lackey was traded from the Boston Red Sox to the Cardinals on Thursday in exchange for first baseman Allen Craig and pitcher Joe Kelly, according to a baseball official with direct knowledge of the trade.

The person spoke on condition of anonymity because the trade has not yet been announced.

The Red Sox, who earlier Thursday dealt ace Jon Lester to the Oakland Athletics, will receive Allen Craig and pitcher Joe Kelly from the Cardinals.

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